Body-Nav entfernen, Dashboard-Header mit Titel und Einstellungen-Link

- <nav id='nav'> samt nav.css komplett entfernt
- Nav-Link-Logik aus app.js und router.js entfernt
- Nav-Hide aus mobile.css entfernt
- Dashboard-Template: Header mit Titel '// gott' und Link 'Einstellungen'
- Dashboard CSS: .dashboard-header mit Flex-Layout
- Einstellungen-Link navigiert zur Settings-Page

wwwroot/index.html

@@ -10,7 +10,7 @@
   <link rel="stylesheet" href="css/theme.css">
   <link rel="stylesheet" href="css/base.css">
   <link rel="stylesheet" href="css/main.css">
-  <link rel="stylesheet" href="css/nav.css">
+
   <link rel="stylesheet" href="css/form.css">
   <link rel="stylesheet" href="css/dashboard.css">
   <link rel="stylesheet" href="css/chat.css">
@@ -24,16 +24,6 @@
 </head>
 <body>
 
-<nav id="nav">
-  <div class="nav-content">
-    <div class="nav-brand">// gott</div>
-    <div class="nav-links">
-      <a href="#" data-page="dashboard" class="nav-link active">Dashboard</a>
-      <a href="#" data-page="settings" class="nav-link">Einstellungen</a>
-    </div>
-  </div>
-</nav>
-
 <div id="app"></div>
 
 <!-- Templates -->
@@ -41,6 +31,10 @@
 <template id="tpl-dashboard">
   <div class="page dashboard">
     <div class="page-content">
+      <div class="dashboard-header">
+        <h1 class="dashboard-title">// gott</h1>
+        <a href="#" id="dashboardSettingsLink" class="dashboard-link">Einstellungen</a>
+      </div>
       <section>
         <div class="section-header">
           <h2>Sessions</h2>